Boiler construction



g B. N. BROIDO BOILER CONSTRUCTION Fil ed April 1. 1925 2 Shets-S'neet 1INVENTOR BEM/HM/A/ ALB o/oo ATTORNEYS g Aug. 23, 1927.

B. N. BROIDO BOILER CONSTRUCTION Filed April. 1, 1925 2 Sheet's-Sneet' 200o000000000000000000000 000000000000000000000000 /000000o o000oo0o00o0o0ooo /00000o000000000000000000 /O O O O O OO O 0.0 O O O O O O0 0OOO O O O/ o 0 0 0 0 M10 m o M 0 0 0 0 0 o o o o 0 0 0 0 0 0 0 0 0 0 0 00 0 o o o o o o o 0 0 0 0 0 0 0 0 0 0 0 o o 0 0 0 0 0 0 0 o 0 0 o 0 0 00 0 0 o 0 0 000 0 .0 0 0 0 0 o 0 0 o 0 o 0 0 A0 0 00 o 0 00 o \fl00o000000000000000000000 000000000000000000000000/o0o00000ooo0000000000000 0000000000000.00000000000 ll 2 m INVENTORPatented Aug 23, 1927. V UNITED STATES 1,640,178 PATENT OFFICE.

BENJAMIN N. BROIDO, 01 NEW YORK, N. Yi, ASSIGNOB TO THE SUPEBKEATEB COI-PANY, NEW YORK, N. Y., A CORPORATION 01 DELAWARE.

1301mm conSgrnucnon.

Application filed April 1, 1925. Serial No. 19,807;

In the construction of the well known Stirling type water tube boilers,having a plurality of separate banks or passes of water tubes of equaldiameter, it is the 5 standard practice to provide-the same number oftubes in each transverse row throu hout all the passes, and to arrangethe tu es in each transverse row in pairs. The space between adjacentpairs is just sufficient to u, allow the ready removal or replacement ofa tube at any part of the boiler, while the space between the tubes ofeach of. said pairs is much more restricted As the modern development ofthe steam u; boiler is towards the general adoption of super-heat muchhigher than heretofore employed, it becomes necessary to place thesuperheater units comparatively close to the furnace and preferablybetween the water 2o tubes of the first bank but because of therestricted space between the water tubes of ,the Stirling type ofboiler, the use of high superheat with "this type of boiler presentsmany difliculties among which the following may be noted: in the firstplace, the

mechanical difliculties in assemblin and installing; secondly, after thesuper eater is installed, the restriction of the gas areathirdly, 1 thetendency of flue dust and to ashes to collect in the spaces between thesuperheater units and water tubes and thereby impair the eflicienc ofthe'boiler; and fourthly, the impracticabilit of increasing the spacingbetween t e tubes which would result not only in unduly increasing thegas area, but would require a much larger floor space for the boiler andalso greatly increase the cost of manufacture.

A It is the principal object of this invention to provide a new andimproved construction and arrangement of a Still? type 'boiler by meansof which the d cultles Q above enumerated are overcome.

Other more specific objects will be apparent to those skilled in the artto which this invention relates from the following description. o

In the drawingswhich illustrate an example of my invention withoutdefining its limits, Fig. 1 is a vertical section through a water tubeboiler of the Stirling type and Fig. 2 is a section taken substantiallon the line2 2 of Fig. 1 looking in the 'rection of the arrows.

As shown in the drawing, the boiler indicated generally by the numeral10 is provided with a furnace 11 from which the gases flow through theboiler to the outlet 12, which is adapted to be connected with '60 asuitablev stack. In accordance with the usual constructions of boilersof this type a plurality of banks or passes 13, 14 an 15 of water tubesextend in a substantially vertical direction and connect the upper steamdrums, 16, 17 and 18 with the lower water drum 19; bafile walls 20 and21 being provided to cause the ases to flow across the tubes in thelongitu inal direction thereof. As shown in Big. 2, the spacing of thetubes in each of the banks 14 and 15 is similar; each of said banksbeing provided with an equal number of rows of tubes transversely of theboiler in accordance with the standard practice. The spacing of the 76tubes of the front bank 13 is greater than in the remaining banks,thisbeing accomplished by providing a smaller number of tubes in thetransverse rows of said front bank. In the example illustrated, 24 rows30 of tubes are rovided in each of the banks 14 and 15, w ile only 20rows are provided in the bank 13. By eliminating a number of rows ofWater tubes in the first bank 13 I am enabled to provide sufiicientspacebe- 35 tween the tubes to permit the installation of thesuperheater units 23 .without crowding the tubes and units too closetogether, thereby overcomin the difficulties enumerated above, wh e atthe same time the 9 overall width of the boiler is not increased and theeffective area of the gas passage I in the first pass is maintainedsubstantially bined cross-sectional area of, the boiler tubes andsuperheater elements which pass through said plane.

As there is a marked tendency towards the adoption of boiler pressuresmany times higher than those heretofore generally employed, the problemsdue to the eat stress placed upon the drums, and particularly the tubestransversely of the boiler spaced apart drums of the first bank whichare subjected to temperatures sufficiently high to affect the strengthof the drum material, become quite difiicult. The construction hereindisclosed, because of the greater s ace provided between the tubes ofthe rst bank, thereby increasing the size of the digament between thetube apertures in the drum, and the protective influence of thesuperheater units interposed between said tubes, therefore possesses thefurther advantage over the standard construction of being exceptionallysuitable for super-pressure boilers.

It will be understood that the number of rows and the arrangement of thetubes in each bank as shown in the drawings. is merely illustrative andthat changes, variations and modifications may be resorted to withoutdeparting from the spirit of my invention.

I claim:

1. In a water tube boiler, a furnace, said boiler having a lurality ofbanks of water tubes located at ifierent distances from said furnace,the first bank of tubes nearest to the furnace having a smaller numberof rows of at greater distances than the remaining banks, and aplurality of superheater units extending downwardly into the boilerbetween the tubes of the first bank, the effective area of the gaspassage formed in said first bank between the superheater units and thewater tubes of said bank being 'no less than the effective area of thegas passage of each of the remaining passes.

2. In a water tube boiler of the Stirling type, a furnace and aplurality of banks of water tubes located at different distances spacebetween t from said furance, each of said banks of' tubes comprising aplurality of rows of tubes arranged 1n non-staggered parallelrelationship and s aced transversely to permit the removal 0 tubesbetween certain adjacent rows, and a plurality of superheater unitsextending downwardly into the boiler between the tubes of the first banknearest to the furnace, the tubes of said first bank being similarlyspaced throughout the entire bank but at greater distances apart than inthe remaining banks to provide sufficient space between said superheaterunits and tubes to avoid unduly restricting the effective passage forthe furnace gases and clogging of flue dust and ashes between said unitsand tubes.

, 3. In a water tube boiler of the Stirling type, a furnace and aplurality of banks of water tubes located at different distances fromsaid furnace, each of said banks of tubes comprising a plurality of rowsof tubes arranged in 'non-staggere'd parallel relationship and spacedtransversely to permit the removal of tubes between certain adjacentrows, and a plurality of rows of superheater units extending downwardlyinto the boiler in the transverse spaces between adjacent parallel rowsof tubes of the first bank nearest to the furnace, the tubes o saidfirst bank being similarly spaced throughout but at greater distancesthan in the remaining banks, there being a clear e furnace and thosesuper-v heater units of each row which are nearest the furnace.

In testimony whereof I have hereunto set m hand.

y BENJAMIN N. BROIDO.

